Those concepts are super cool, but they're also super futuristic. As in, they probably won't be available to regular people for a few decades. For now, the most common leg prosthetic is essentially a peg leg with a simple cup-shaped socket placed over the stump (or "residual limb," if you want to get technical). Those types of limbs tend to be uncomfortable; they cause chafing and alter the biomechanics of walking in ways that put strain on the back and other body parts.

A group of researchers at University College London has developed what may turn out to be a better idea. In a clinical trial that just wrapped, they implanted 20 amputees with prosthetics that interface directly with the patient's skeleton. Voil?, the chafing disappears, and patients get a lot more tactile feedback than regular prosthetics.